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qb_compiler.c
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/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2012 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Chung Leong <cleong@cal.berkeley.edu> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include "qb.h"
#include "qb_compiler_optimization.c"
static void qb_add_variable(qb_compiler_context *cxt, qb_variable *variable) {
qb_variable **p = qb_enlarge_array((void **) &cxt->variables, 1);
*p = variable;
cxt->function_prototype.variables = cxt->variables;
cxt->function_prototype.variable_count = cxt->variable_count;
}
void qb_mark_as_tagged(qb_compiler_context *cxt, qb_address *address) {
address->flags |= QB_ADDRESS_TAGGED;
if(address->source_address) {
qb_mark_as_tagged(cxt, address->source_address);
}
}
void qb_mark_as_constant(qb_compiler_context *cxt, qb_address *address) {
address->flags |= QB_ADDRESS_CONSTANT;
if(address->source_address) {
qb_mark_as_constant(cxt, address->source_address);
}
}
void qb_mark_as_temporary(qb_compiler_context *cxt, qb_address *address) {
address->flags |= QB_ADDRESS_TEMPORARY | QB_ADDRESS_NON_REUSABLE | QB_ADDRESS_IN_USE;
if(address->source_address) {
qb_mark_as_temporary(cxt, address->source_address);
}
}
void qb_mark_as_writable(qb_compiler_context *cxt, qb_address *address) {
address->flags &= ~QB_ADDRESS_READ_ONLY;
if(address->source_address) {
qb_mark_as_writable(cxt, address->source_address);
}
}
void qb_mark_as_static(qb_compiler_context *cxt, qb_address *address) {
if(IS_READ_ONLY(address)) {
address->flags |= QB_ADDRESS_STATIC;
if(IS_VARIABLE_LENGTH(address)) {
// dimensions that aren't constant must become static as well
uint32_t i;
for(i = 0; i < address->dimension_count; i++) {
qb_address *dimension_address = address->dimension_addresses[i];
qb_address *array_size_address = address->dimension_addresses[i];
if(!IS_IMMUTABLE(dimension_address)) {
dimension_address->flags |= QB_ADDRESS_STATIC;
}
if(!IS_IMMUTABLE(array_size_address)) {
array_size_address->flags |= QB_ADDRESS_STATIC;
}
}
}
}
}
void qb_mark_as_shared(qb_compiler_context *cxt, qb_address *address) {
address->flags |= QB_ADDRESS_SHARED;
if(IS_VARIABLE_LENGTH(address)) {
// dimensions that aren't constant must become shared as well
uint32_t i;
for(i = 0; i < address->dimension_count; i++) {
qb_address *dimension_address = address->dimension_addresses[i];
qb_address *array_size_address = address->dimension_addresses[i];
if(!IS_IMMUTABLE(dimension_address)) {
dimension_address->flags |= QB_ADDRESS_SHARED;
}
if(!IS_IMMUTABLE(array_size_address)) {
array_size_address->flags |= QB_ADDRESS_SHARED;
}
}
}
}
void qb_lock_address(qb_compiler_context *cxt, qb_address *address) {
if(!IS_IN_USE(address) && IS_TEMPORARY(address)) {
address->flags |= QB_ADDRESS_IN_USE;
if(address->source_address) {
qb_lock_address(cxt, address->source_address);
}
if(IS_TEMPORARY(address->array_size_address)) {
qb_lock_address(cxt, address->array_size_address);
}
if(address->dimension_count > 1) {
uint32_t i;
for(i = 0; i < address->dimension_count; i++) {
qb_lock_address(cxt, address->array_size_addresses[i]);
qb_lock_address(cxt, address->dimension_addresses[i]);
}
}
}
if(IS_TEMPORARY(address->array_index_address)) {
qb_lock_address(cxt, address->array_index_address);
}
}
void qb_unlock_address(qb_compiler_context *cxt, qb_address *address) {
if(IS_IN_USE(address) && IS_TEMPORARY(address)) {
address->flags &= ~QB_ADDRESS_IN_USE;
if(address->source_address) {
qb_unlock_address(cxt, address->source_address);
}
if(IS_TEMPORARY(address->array_index_address)) {
qb_unlock_address(cxt, address->array_index_address);
}
if(IS_TEMPORARY(address->array_size_address)) {
qb_unlock_address(cxt, address->array_size_address);
}
}
}
void qb_lock_operand(qb_compiler_context *cxt, qb_operand *operand) {
if(operand->type == QB_OPERAND_ADDRESS) {
qb_lock_address(cxt, operand->address);
} else if(operand->type == QB_OPERAND_ARRAY_INITIALIZER) {
uint32_t i;
for(i = 0; i < operand->array_initializer->element_count; i++) {
qb_lock_operand(cxt, &operand->array_initializer->elements[i]);
}
}
}
void qb_unlock_operand(qb_compiler_context *cxt, qb_operand *operand) {
if(operand->type == QB_OPERAND_ADDRESS) {
qb_unlock_address(cxt, operand->address);
} else if(operand->type == QB_OPERAND_ARRAY_INITIALIZER) {
uint32_t i;
for(i = 0; i < operand->array_initializer->element_count; i++) {
qb_unlock_operand(cxt, &operand->array_initializer->elements[i]);
}
}
}
int32_t qb_is_source_op_translated(qb_compiler_context *cxt, uint32_t source_index) {
if(source_index < cxt->op_translation_table_size) {
uint32_t qop_index = cxt->op_translation_table[source_index];
if(qop_index < cxt->op_count) {
return TRUE;
}
}
return FALSE;
}
uint32_t qb_set_source_file(qb_compiler_context *cxt, const char *file_path) {
return cxt->source_file_id;
}
uint32_t qb_set_source_op_index(qb_compiler_context *cxt, uint32_t source_index, uint32_t line_number) {
uint32_t op_index;
if(cxt->stage == QB_STAGE_OPCODE_TRANSLATION) {
if(source_index >= cxt->op_translation_table_size) {
// expand the table
uint32_t original_size = cxt->op_translation_table_size;
uint32_t addition = (source_index + 1) - original_size;
uint32_t *new_entries = qb_enlarge_array((void **) &cxt->op_translation_table, addition);
uint32_t i;
for(i = 0; i < addition; i++) {
new_entries[i] = INVALID_INDEX;
}
}
cxt->op_translation_table[source_index] = op_index = cxt->op_count;
} else {
op_index = INVALID_INDEX;
}
cxt->source_file_line_number = line_number;
cxt->source_op_index = source_index;
cxt->line_id = LINE_ID(cxt->source_file_id, cxt->source_file_line_number);
return op_index;
}
static uint32_t qb_get_translated_op_index(qb_compiler_context *cxt, uint32_t jump_target_index) {
int32_t offset = OP_INDEX_OFFSET(jump_target_index);
uint32_t source_index = OP_INDEX(jump_target_index);
uint32_t qop_index = cxt->op_translation_table[source_index] + offset;
return qop_index;
}
void qb_add_jump_target(qb_compiler_context *cxt, uint32_t jump_target_index) {
qb_jump_target *jump_target;
if(!cxt->jump_targets) {
qb_attach_new_array(cxt->pool, (void **) &cxt->jump_targets, &cxt->jump_target_count, sizeof(qb_jump_target), 16);
}
jump_target = qb_enlarge_array((void **) &cxt->jump_targets, 1);
jump_target->jump_target_index = jump_target_index;
}
int32_t qb_is_jump_target(qb_compiler_context *cxt, uint32_t source_op_index) {
uint32_t i = 0;
for(i = 0; i < cxt->jump_target_count; i++) {
qb_jump_target *jump_target = &cxt->jump_targets[i];
if(OP_INDEX(jump_target->jump_target_index) == source_op_index) {
return TRUE;
}
}
return FALSE;
}
static void qb_invalidate_expression(qb_compiler_context *cxt, qb_expression *expr) {
uint32_t i;
for(i = 0; i < expr->operand_count + 1; i++) {
qb_unlock_operand(cxt, &expr->operands[i]);
}
expr->flags &= ~QB_EXPR_RESULT_IS_STILL_VALID;
expr->result->type = QB_OPERAND_EMPTY;
expr->result->generic_pointer = NULL;
}
static int32_t qb_match_address(qb_compiler_context *cxt, qb_address *address1, qb_address *address2) {
qb_address *a, *b;
for(a = address1; a; a = a->source_address) {
for(b = address2; b; b = b->source_address) {
if(a == b) {
return TRUE;
}
}
}
return FALSE;
}
static void qb_invalidate_on_demand_expressions(qb_compiler_context *cxt, qb_address *address) {
int32_t is_tagged = FALSE;
qb_address *a;
for(a = address; a; a = a->source_address) {
if(IS_TAGGED(a)) {
is_tagged = TRUE;
break;
}
}
if(is_tagged) {
uint32_t i, j;
for(i = 0; i < cxt->on_demand_expression_count; i++) {
qb_expression *expr = cxt->on_demand_expressions[i];
if(expr->flags & QB_EXPR_RESULT_IS_STILL_VALID) {
for(j = 0; j < expr->operand_count + 1; j++) {
qb_operand *operand = &expr->operands[j];
if(operand->type == QB_OPERAND_ADDRESS) {
if(qb_match_address(cxt, address, operand->address)) {
qb_invalidate_expression(cxt, expr);
break;
}
}
}
}
}
}
}
void qb_invalidate_all_on_demand_expressions(qb_compiler_context *cxt) {
uint32_t i;
for(i = 0; i < cxt->on_demand_expression_count; i++) {
qb_expression *expr = cxt->on_demand_expressions[i];
if(expr->flags & QB_EXPR_RESULT_IS_STILL_VALID) {
qb_invalidate_expression(cxt, expr);
}
}
}
qb_expression * qb_get_on_demand_expression(qb_compiler_context *cxt, void *op_factory, qb_operand *operands, uint32_t operand_count) {
qb_expression *expr, **p_expr;
uint32_t i, j;
// see if there's an existing expression
for(i = 0; i < cxt->on_demand_expression_count; i++) {
expr = cxt->on_demand_expressions[i];
if(expr->op_factory == op_factory && expr->operand_count == operand_count) {
int32_t match = TRUE;
for(j = 0; j < expr->operand_count; j++) {
if(expr->operands[j].type == operands[j].type) {
if(operands[j].type == QB_OPERAND_ADDRESS) {
if(expr->operands[j].address != operands[j].address) {
match = FALSE;
}
} else if(operands[j].type == QB_OPERAND_NUMBER) {
if(expr->operands[j].number != operands[j].number) {
match = FALSE;
}
} else if(operands[j].type == QB_OPERAND_ZEND_CLASS) {
if(expr->operands[j].zend_class != operands[j].zend_class) {
match = FALSE;
}
}
} else {
match = FALSE;
}
}
if(match) {
return expr;
}
}
}
// create the expression
expr = qb_allocate_expression(cxt->pool);
expr->flags = QB_EXPR_EXECUTE_BEFORE;
expr->operands = qb_allocate_operands(cxt->pool, operand_count + 1);
expr->operand_count = operand_count;
expr->op_factory = op_factory;
for(i = 0; i < operand_count; i++) {
qb_operand *operand = &operands[i];
expr->operands[i] = *operand;
if(operand->type == QB_OPERAND_ADDRESS) {
// tag the address so we know it is being used in an on-demand expression
qb_mark_as_tagged(cxt, operand->address);
}
}
expr->result = &expr->operands[operand_count];
expr->result->type = QB_OPERAND_EMPTY;
expr->result->address = NULL;
p_expr = qb_enlarge_array((void **) &cxt->on_demand_expressions, 1);
*p_expr = expr;
return expr;
}
// the qb_obtain_on_demand_??? functions only works with U32 scalar addresses
qb_address * qb_obtain_on_demand_sum(qb_compiler_context *cxt, qb_address *augend_address, qb_address *addend_address) {
if(IS_IMMUTABLE(augend_address) && IS_IMMUTABLE(addend_address)) {
uint32_t sum = VALUE(U32, augend_address) + VALUE(U32, addend_address);
return qb_obtain_constant_U32(cxt, sum);
} else if(IS_IMMUTABLE(augend_address) && VALUE(U32, augend_address) == 0) {
// 0 + addend = addend
return addend_address;
} else if(IS_IMMUTABLE(addend_address) && VALUE(U32, addend_address) == 0) {
// augend + 0 = augend
return augend_address;
} else {
qb_operand operands[2] = { { QB_OPERAND_ADDRESS, { augend_address } }, { QB_OPERAND_ADDRESS, { addend_address } } };
return qb_obtain_on_demand_value(cxt, &factory_add, operands, 2);
}
}
qb_address * qb_obtain_on_demand_difference(qb_compiler_context *cxt, qb_address *minuend_address, qb_address *subtrahend_address) {
if(IS_IMMUTABLE(minuend_address) && IS_IMMUTABLE(subtrahend_address)) {
uint32_t difference = VALUE(U32, minuend_address) - VALUE(U32, subtrahend_address);
return qb_obtain_constant_U32(cxt, difference);
} else if(IS_IMMUTABLE(subtrahend_address) && VALUE(U32, subtrahend_address) == 0) {
// minuend - 0 = minuend
return minuend_address;
} else {
qb_operand operands[2] = { { QB_OPERAND_ADDRESS, { minuend_address } }, { QB_OPERAND_ADDRESS, { subtrahend_address } } };
return qb_obtain_on_demand_value(cxt, &factory_subtract, operands, 2);
}
}
qb_address * qb_obtain_on_demand_product(qb_compiler_context *cxt, qb_address *multiplicand_address, qb_address *multiplier_address) {
if(IS_IMMUTABLE(multiplicand_address) && IS_IMMUTABLE(multiplier_address)) {
uint32_t product = VALUE(U32, multiplicand_address) * VALUE(U32, multiplier_address);
return qb_obtain_constant_U32(cxt, product);
} else if(IS_IMMUTABLE(multiplicand_address) && VALUE(U32, multiplicand_address) == 0) {
// 0 * multiplier = 0
return qb_obtain_constant_U32(cxt, 0);
} else if(IS_IMMUTABLE(multiplicand_address) && VALUE(U32, multiplicand_address) == 1) {
// 1 * multiplier = multiplier
return multiplier_address;
} else if(IS_IMMUTABLE(multiplier_address) && VALUE(U32, multiplier_address) == 0) {
// multiplicand * 0 = 0
return qb_obtain_constant_U32(cxt, 0);
} else if(IS_IMMUTABLE(multiplier_address) && VALUE(U32, multiplier_address) == 1) {
// multiplicand * 1 = multiplicand
return multiplicand_address;
} else {
qb_operand operands[2] = { { QB_OPERAND_ADDRESS, { multiplicand_address } }, { QB_OPERAND_ADDRESS, { multiplier_address } } };
return qb_obtain_on_demand_value(cxt, &factory_real_multiply, operands, 2);
}
}
qb_address * qb_obtain_on_demand_quotient(qb_compiler_context *cxt, qb_address *numerator_address, qb_address *denominator_address) {
if(IS_IMMUTABLE(numerator_address) && IS_IMMUTABLE(denominator_address)) {
uint32_t quotient = VALUE(U32, numerator_address) / VALUE(U32, denominator_address);
return qb_obtain_constant_U32(cxt, quotient);
} else {
qb_operand operands[2] = { { QB_OPERAND_ADDRESS, { numerator_address } }, { QB_OPERAND_ADDRESS, { denominator_address } } };
return qb_obtain_on_demand_value(cxt, &factory_divide, operands, 2);
}
}
static uint32_t qb_get_undefined_dimension_count(qb_compiler_context *cxt, qb_address *address) {
uint32_t i;
uint32_t count = 0;
for(i = 0; i < address->dimension_count; i++) {
qb_address *dimension_address = DIMENSION_ADDRESS(address, i);
if(!IS_IMMUTABLE(dimension_address)) {
count++;
}
}
return count;
}
void qb_attach_bound_checking_expression(qb_compiler_context *cxt, qb_address *address, qb_variable_dimensions *dim, int32_t resizing) {
qb_expression *expr = NULL;
if(address->array_size_address == dim->array_size_address) {
// size match: no bound-checking needed
return;
} else {
if(IS_IMMUTABLE(address->array_size_address) && IS_IMMUTABLE(dim->array_size_address)) {
uint32_t dst_size = VALUE(U32, address->array_size_address);
uint32_t src_size = VALUE(U32, dim->array_size_address);
// the destination is large enough
if(dst_size > src_size) {
return;
}
}
if(resizing && IS_RESIZABLE(address)) {
// accommodate the input by resizing the array
// if it's multidimensional, the dimension has to be updated as well
if(address->dimension_count > 1) {
USE_TSRM
uint32_t undefined_dimension_count = qb_get_undefined_dimension_count(cxt, address);
uint32_t defined_dimension_count = address->dimension_count - undefined_dimension_count;
if(undefined_dimension_count == 1) {
qb_operand operands[6] = { { QB_OPERAND_ADDRESS, { dim->array_size_address } }, { QB_OPERAND_ADDRESS, { address->array_size_address } }, { QB_OPERAND_ADDRESS, { address->dimension_addresses[0] } }, { QB_OPERAND_ADDRESS, { address->array_size_addresses[1] } }, { QB_OPERAND_SEGMENT_SELECTOR, { address } }, { QB_OPERAND_ELEMENT_SIZE, { address } } };
expr = qb_get_on_demand_expression(cxt, &factory_accommodate_array_size_update_dimension, operands, 6);
} else {
uint32_t i, j;
if(address->dimension_count == dim->dimension_count) {
qb_operand operands[MAX_DIMENSION * 4 + 2];
for(i = undefined_dimension_count; i < address->dimension_count; i++) {
if(address->dimension_addresses[i] != dim->dimension_addresses[i]) {
uint32_t dimension1 = VALUE(U32, address->dimension_addresses[i]);
uint32_t dimension2 = VALUE(U32, dim->dimension_addresses[i]);
qb_report_dimension_mismatch_exception(cxt->line_id, dimension1, dimension2);
return;
}
}
for(i = 0; i < undefined_dimension_count; i++) {
operands[i * 4 + 0].address = dim->array_size_addresses[i];
operands[i * 4 + 0].type = QB_OPERAND_ADDRESS;
operands[i * 4 + 1].address = dim->dimension_addresses[i];
operands[i * 4 + 1].type = QB_OPERAND_ADDRESS;
operands[i * 4 + 2].address = address->array_size_addresses[i];
operands[i * 4 + 2].type = QB_OPERAND_ADDRESS;
operands[i * 4 + 3].address = address->dimension_addresses[i];
operands[i * 4 + 3].type = QB_OPERAND_ADDRESS;
}
operands[undefined_dimension_count * 4 + 0].address = address;
operands[undefined_dimension_count * 4 + 0].type = QB_OPERAND_SEGMENT_SELECTOR;
operands[undefined_dimension_count * 4 + 1].address = address;
operands[undefined_dimension_count * 4 + 1].type = QB_OPERAND_ELEMENT_SIZE;
expr = qb_get_on_demand_expression(cxt, &factory_accommodate_array_size_copy_dimension, operands, undefined_dimension_count * 4 + 2);
} else if(dim->dimension_count == 0) {
// assignment from a scalar is okay
} else if(defined_dimension_count == dim->dimension_count) {
// no resizing
for(i = undefined_dimension_count, j = 0; i < address->dimension_count; i++, j++) {
if(address->dimension_addresses[i] != dim->dimension_addresses[j]) {
uint32_t dimension1 = VALUE(U32, address->dimension_addresses[i]);
uint32_t dimension2 = VALUE(U32, dim->dimension_addresses[i]);
qb_report_dimension_mismatch_exception(cxt->line_id, dimension1, dimension2);
return;
}
}
} else {
qb_report_dimension_count_mismatch_exception(cxt->line_id, address->dimension_count, dim->dimension_count);
return;
}
}
} else {
qb_operand operands[4] = { { QB_OPERAND_ADDRESS, { dim->array_size_address } }, { QB_OPERAND_ADDRESS, { address->array_size_address } }, { QB_OPERAND_SEGMENT_SELECTOR, { address } }, { QB_OPERAND_ELEMENT_SIZE, { address } } };
expr = qb_get_on_demand_expression(cxt, &factory_accommodate_array_size, operands, 4);
}
} else {
// a scalar will not cause overrun
if(cxt->one_address == dim->array_size_address) {
return;
} else {
// need to guard against overrun
qb_operand operands[2] = { { QB_OPERAND_ADDRESS, { dim->array_size_address } }, { QB_OPERAND_ADDRESS, { address->array_size_address } } };
expr = qb_get_on_demand_expression(cxt, &factory_guard_array_size, operands, 2);
}
}
}
if(expr) {
// don't attach it if the result of a previous check is still valid
if(!(expr->flags & QB_EXPR_RESULT_IS_STILL_VALID)) {
address->expression = expr;
}
}
}
static void qb_update_storage_location(qb_compiler_context *cxt, qb_address *address) {
if(address->source_address) {
qb_update_storage_location(cxt, address->source_address);
if(address->segment_selector == QB_SELECTOR_INVALID) {
address->segment_selector = address->source_address->segment_selector;
}
if(address->segment_offset == QB_OFFSET_INVALID) {
address->segment_offset = address->source_address->segment_offset;
}
if(address->mode == QB_ADDRESS_MODE_SCA && address->array_index_address != cxt->zero_address) {
// add the offset
uint32_t index = VALUE(U32, address->array_index_address);
address->segment_offset += BYTE_COUNT(index, address->type);
address->array_index_address = cxt->zero_address;
}
}
}
// allocate segment memory for address
void qb_allocate_storage_space(qb_compiler_context *cxt, qb_address *address, int32_t need_actual_memory) {
if(address->source_address) {
if(address->source_address->segment_selector == QB_SELECTOR_INVALID) {
qb_allocate_storage_space(cxt, address->source_address, need_actual_memory);
}
qb_update_storage_location(cxt, address);
} else {
uint32_t selector, element_count, byte_count, new_segment_flags, alignment;
uint32_t start_offset, end_offset;
qb_memory_segment *segment;
if(IS_SCALAR(address)) {
element_count = 1;
byte_count = BYTE_COUNT(1, address->type);
alignment = max(byte_count, 4);
} else {
if(IS_FIXED_LENGTH(address)) {
element_count = ARRAY_SIZE(address);
byte_count = BYTE_COUNT(element_count, address->type);
} else {
element_count = 0;
byte_count = 0;
}
alignment = 16;
}
// determine which segment should be used
if(IS_SCALAR(address)) {
if(IS_IMMUTABLE(address)) {
selector = QB_SELECTOR_CONSTANT_SCALAR;
} else if(IS_TEMPORARY(address)) {
selector = QB_SELECTOR_TEMPORARY_SCALAR;
} else if(IS_STATIC(address)) {
selector = QB_SELECTOR_STATIC_SCALAR;
} else if(IS_SHARED(address)) {
selector = QB_SELECTOR_SHARED_SCALAR;
} else {
selector = QB_SELECTOR_LOCAL_SCALAR;
}
} else if(element_count > 0 && byte_count <= 10240) {
// the array is fixed-length and isn't bigger than 10K
if(IS_IMMUTABLE(address)) {
selector = QB_SELECTOR_CONSTANT_ARRAY;
} else if(IS_TEMPORARY(address)) {
selector = QB_SELECTOR_TEMPORARY_ARRAY;
} else if(IS_STATIC(address)) {
selector = QB_SELECTOR_STATIC_ARRAY;
} else if(IS_SHARED(address)) {
selector = QB_SELECTOR_SHARED_ARRAY;
} else {
selector = QB_SELECTOR_LOCAL_ARRAY;
}
} else {
// it's a variable-length array or a big fixed-length array
selector = cxt->storage->segment_count;
if(IS_TEMPORARY(address)) {
new_segment_flags = QB_SEGMENT_FREE_ON_RETURN | QB_SEGMENT_SEPARATE_ON_FORK | QB_SEGMENT_SEPARATE_ON_REENTRY;
} else if(IS_STATIC(address)) {
new_segment_flags = 0;
} else if(IS_SHARED(address)) {
new_segment_flags = QB_SEGMENT_FREE_ON_RETURN | QB_SEGMENT_CLEAR_ON_CALL | QB_SEGMENT_SEPARATE_ON_REENTRY;
} else {
new_segment_flags = QB_SEGMENT_FREE_ON_RETURN | QB_SEGMENT_CLEAR_ON_CALL | QB_SEGMENT_SEPARATE_ON_FORK | QB_SEGMENT_SEPARATE_ON_REENTRY;
}
if(byte_count > 0) {
new_segment_flags |= QB_SEGMENT_REALLOCATE_ON_CALL;
} else {
if(new_segment_flags & QB_SEGMENT_FREE_ON_RETURN) {
// don't just free the memory--set the segment length to 0 as well
// so it doesn't get reallocated on the next call
new_segment_flags |= QB_SEGMENT_EMPTY_ON_RETURN;
}
}
}
// create a new segment if necessary
if(selector >= cxt->storage->segment_count) {
cxt->storage->segment_count = selector + 1;
cxt->storage->segments = erealloc(cxt->storage->segments, sizeof(qb_memory_segment) * cxt->storage->segment_count);
segment = &cxt->storage->segments[selector];
memset(segment, 0, sizeof(qb_memory_segment));
segment->flags = new_segment_flags;
} else {
segment = &cxt->storage->segments[selector];
}
start_offset = ALIGN_TO(segment->byte_count, alignment);
end_offset = start_offset + byte_count;
// allocate memory if we're going to write to the address at compile time
// should be true except when called by qb_assign_storage_space() down below
if(need_actual_memory) {
if(end_offset > segment->current_allocation) {
segment->current_allocation += 1024;
if(end_offset > segment->current_allocation) {
segment->current_allocation = end_offset;
}
segment->memory = erealloc(segment->memory, segment->current_allocation);
}
if(start_offset > segment->byte_count) {
// clear the padding bytes since we might calculate the checksum of the memory segment
// (and we want the same value for the same constants)
memset(segment->memory + segment->byte_count, 0, start_offset - segment->byte_count);
}
}
segment->byte_count = end_offset;
// fit in the info
address->segment_selector = selector;
address->segment_offset = start_offset;
}
}
void qb_allocate_external_storage_space(qb_compiler_context *cxt, qb_variable *var) {
USE_TSRM
qb_import_scope *scope = qb_get_import_scope(cxt->storage, var, NULL TSRMLS_CC);
qb_variable *ivar = qb_get_import_variable(cxt->storage, var, scope TSRMLS_CC);
uint32_t selector, start_offset;
if(ivar->address->segment_selector >= QB_SELECTOR_ARRAY_START) {
// use a new segment
selector = cxt->storage->segment_count;
start_offset = ivar->address->segment_offset;
} else {
// use the same segment as in the scope
selector = ivar->address->segment_selector;
start_offset = ivar->address->segment_offset;
}
if(var->address->dimension_count > 0) {
// set the locations of the dimensional variables as well if they aren't constant
if(var->address->dimension_count == 1) {
if(!IS_IMMUTABLE(var->address->array_size_address)) {
var->address->array_size_address->segment_selector = ivar->address->array_size_address->segment_selector;
var->address->array_size_address->segment_offset = ivar->address->array_size_address->segment_offset;
}
} else {
uint32_t i;
for(i = 0; i < var->address->dimension_count; i++) {
if(!IS_IMMUTABLE(var->address->array_size_addresses[i])) {
var->address->array_size_addresses[i]->segment_selector = ivar->address->array_size_addresses[i]->segment_selector;
var->address->array_size_addresses[i]->segment_offset = ivar->address->array_size_addresses[i]->segment_offset;
var->address->dimension_addresses[i]->segment_selector = ivar->address->dimension_addresses[i]->segment_selector;
var->address->dimension_addresses[i]->segment_offset = ivar->address->dimension_addresses[i]->segment_offset;
}
}
}
}
if(selector >= cxt->storage->segment_count) {
qb_memory_segment *segment;
cxt->storage->segment_count = selector + 1;
cxt->storage->segments = erealloc(cxt->storage->segments, sizeof(qb_memory_segment) * cxt->storage->segment_count);
segment = &cxt->storage->segments[selector];
memset(segment, 0, sizeof(qb_memory_segment));
}
var->address->segment_selector = selector;
var->address->segment_offset = start_offset;
}
// assign storage space to variables
void qb_assign_storage_space(qb_compiler_context *cxt) {
uint32_t i;
// set current_allocation to the byte_count so we know how much real
// data there's in each segment
for(i = 0; i < cxt->storage->segment_count; i++) {
qb_memory_segment *segment = &cxt->storage->segments[i];
segment->current_allocation = segment->byte_count;
}
// deal with external variables first
for(i = 0; i < cxt->variable_count; i++) {
qb_variable *qvar = cxt->variables[i];
if(qvar->flags & (QB_VARIABLE_GLOBAL | QB_VARIABLE_LEXICAL)) {
qb_allocate_external_storage_space(cxt, qvar);
} else if((qvar->flags & QB_VARIABLE_CLASS) || (qvar->flags & QB_VARIABLE_CLASS_INSTANCE) || (qvar->flags & QB_VARIABLE_CLASS_CONSTANT)) {
if(!qvar->zend_class) {
// static:: qualifier--give it a scope temporarily
qvar->zend_class = cxt->zend_op_array->scope;
qb_allocate_external_storage_space(cxt, qvar);
qvar->zend_class = NULL;
} else {
qb_allocate_external_storage_space(cxt, qvar);
}
}
}
for(i = 0; i < cxt->writable_scalar_count; i++) {
qb_address *address = cxt->writable_scalars[i];
if(address->segment_selector == QB_SELECTOR_INVALID) {
// if it's temporary yet remains read-only, then it was never used
if(!IS_TEMPORARY(address) || !IS_READ_ONLY(address)) {
qb_allocate_storage_space(cxt, address, FALSE);
}
}
}
for(i = 0; i < cxt->writable_array_count; i++) {
qb_address *address = cxt->writable_arrays[i];
if(address->segment_selector == QB_SELECTOR_INVALID) {
if(!IS_TEMPORARY(address) || !IS_READ_ONLY(address)) {
qb_allocate_storage_space(cxt, address, FALSE);
}
}
}
// update the address aliases
for(i = 0; i < cxt->address_alias_count; i++) {
qb_address *address = cxt->address_aliases[i];
qb_update_storage_location(cxt, address);
}
}
qb_address * qb_create_address_alias(qb_compiler_context *cxt, qb_address *address) {
qb_address *alias = qb_allocate_address(cxt->pool);
qb_address **p_alias = qb_enlarge_array((void **) &cxt->address_aliases, 1);
*alias = *address;
alias->source_address = address;
alias->flags |= QB_ADDRESS_ALIAS;
*p_alias = alias;
return alias;
}
qb_address * qb_obtain_alias(qb_compiler_context *cxt, qb_address *address, uint32_t flag) {
qb_address *alias;
if(address->flags & flag) {
return address;
} else {
uint32_t i;
for(i = 0; i < cxt->address_alias_count; i++) {
alias = cxt->address_aliases[i];
if(alias->source_address == address) {
if(alias->flags & flag) {
if(address->expression) {
// attach the expression onto the alias
alias->expression = address->expression;
}
if(address->flags & QB_ADDRESS_IN_USE) {
alias->flags |= QB_ADDRESS_IN_USE;
} else {
alias->flags &= ~QB_ADDRESS_IN_USE;
}
return alias;
}
}
}
}
alias = qb_create_address_alias(cxt, address);
alias->flags |= flag;
return alias;
}
qb_address * qb_obtain_cast_alias(qb_compiler_context *cxt, qb_address *address, qb_primitive_type type) {
qb_address *alias;
uint32_t i;
for(i = 0; i < cxt->address_alias_count; i++) {
alias = cxt->address_aliases[i];
if(alias->source_address == address) {
if(alias->flags & QB_ADDRESS_CAST) {
return alias;
}
}
}
alias = qb_create_address_alias(cxt, address);
alias->flags |= QB_ADDRESS_CAST;
alias->type = type;
return alias;
}
qb_address * qb_obtain_array_alias(qb_compiler_context *cxt, qb_address *address) {
qb_address *alias;
uint32_t i;
for(i = 0; i < cxt->address_alias_count; i++) {
alias = cxt->address_aliases[i];
if(alias->source_address == address) {
if(alias->dimension_count == 1) {
return alias;
}
}
}
alias = qb_create_address_alias(cxt, address);
alias->dimension_count = 1;
alias->mode = QB_ADDRESS_MODE_ARR;
return alias;
}
qb_address * qb_create_constant_scalar(qb_compiler_context *cxt, qb_primitive_type element_type) {
qb_address *address = qb_allocate_address(cxt->pool);
address->mode = QB_ADDRESS_MODE_SCA;
address->type = element_type;
address->flags = QB_ADDRESS_READ_ONLY | QB_ADDRESS_CONSTANT;
address->array_index_address = cxt->zero_address;
address->array_size_address = cxt->one_address;
address->array_size_addresses =
address->dimension_addresses = &address->array_size_address;
qb_allocate_storage_space(cxt, address, TRUE);
qb_add_constant_scalar(cxt, address);
return address;
}
static qb_address * qb_obtain_constant_I08(qb_compiler_context *cxt, int8_t value, uint32_t sign_flag) {
qb_address *address;
uint32_t i, type = QB_TYPE_I08 | sign_flag;
for(i = 0; i < cxt->constant_scalar_count; i++) {
address = cxt->constant_scalars[i];
if(STORAGE_TYPE_MATCH(address->type, QB_TYPE_I08)) {
if(VALUE(I08, address) == value) {
if(address->type == type) {
return address;
} else {
return qb_obtain_cast_alias(cxt, address, type);
}
}
}
}
address = qb_create_constant_scalar(cxt, type);
VALUE(I08, address) = value;
return address;
}
qb_address * qb_obtain_constant_S08(qb_compiler_context *cxt, int8_t value) {
return qb_obtain_constant_I08(cxt, value, 0);
}
qb_address * qb_obtain_constant_U08(qb_compiler_context *cxt, uint8_t value) {
return qb_obtain_constant_I08(cxt, value, QB_TYPE_UNSIGNED);
}
static qb_address * qb_obtain_constant_I16(qb_compiler_context *cxt, int16_t value, uint32_t sign_flag) {
qb_address *address;
uint32_t i, type = QB_TYPE_I16 | sign_flag;
for(i = 0; i < cxt->constant_scalar_count; i++) {
address = cxt->constant_scalars[i];
if(STORAGE_TYPE_MATCH(address->type, QB_TYPE_I16)) {
if(VALUE(I16, address) == value) {
if(address->type == type) {
return address;
} else {
return qb_obtain_cast_alias(cxt, address, type);
}
}
}
}
address = qb_create_constant_scalar(cxt, type);
VALUE(I16, address) = value;
return address;
}
qb_address * qb_obtain_constant_S16(qb_compiler_context *cxt, int16_t value) {
return qb_obtain_constant_I16(cxt, value, 0);
}
qb_address * qb_obtain_constant_U16(qb_compiler_context *cxt, uint16_t value) {
return qb_obtain_constant_I16(cxt, value, QB_TYPE_UNSIGNED);
}
static qb_address * qb_obtain_constant_I32(qb_compiler_context *cxt, int32_t value, uint32_t sign_flag) {
qb_address *address;
uint32_t i, type = QB_TYPE_I32 | sign_flag;
for(i = 0; i < cxt->constant_scalar_count; i++) {
address = cxt->constant_scalars[i];
if(STORAGE_TYPE_MATCH(address->type, QB_TYPE_I32)) {
if(VALUE(I32, address) == value) {
if(address->type == type) {
return address;
} else {
return qb_obtain_cast_alias(cxt, address, type);
}
}
}
}
address = qb_create_constant_scalar(cxt, type);
VALUE(I32, address) = value;
return address;
}
qb_address * qb_obtain_constant_S32(qb_compiler_context *cxt, int32_t value) {
return qb_obtain_constant_I32(cxt, value, 0);
}
qb_address * qb_obtain_constant_U32(qb_compiler_context *cxt, uint32_t value) {
return qb_obtain_constant_I32(cxt, value, QB_TYPE_UNSIGNED);
}
static qb_address * qb_obtain_constant_I64(qb_compiler_context *cxt, int64_t value, uint32_t sign_flag) {
qb_address *address;
uint32_t i, type = QB_TYPE_I64 | sign_flag;
for(i = 0; i < cxt->constant_scalar_count; i++) {
address = cxt->constant_scalars[i];
if(STORAGE_TYPE_MATCH(address->type, QB_TYPE_I64)) {
if(VALUE(I64, address) == value) {
if(address->type == type) {
return address;
} else {
return qb_obtain_cast_alias(cxt, address, type);
}
}
}
}
address = qb_create_constant_scalar(cxt, type);
VALUE(I64, address) = value;
return address;
}
qb_address * qb_obtain_constant_S64(qb_compiler_context *cxt, int64_t value) {
return qb_obtain_constant_I64(cxt, value, 0);
}
qb_address * qb_obtain_constant_U64(qb_compiler_context *cxt, uint64_t value) {
return qb_obtain_constant_I64(cxt, value, QB_TYPE_UNSIGNED);
}
qb_address * qb_obtain_constant_F32(qb_compiler_context *cxt, float32_t value) {
qb_address *address;
uint32_t i;
for(i = 0; i < cxt->constant_scalar_count; i++) {
address = cxt->constant_scalars[i];
if(address->type == QB_TYPE_F32) {
if(VALUE(F32, address) == value) {
return address;
}
}
}
address = qb_create_constant_scalar(cxt, QB_TYPE_F32);
VALUE(F32, address) = value;
return address;
}
qb_address * qb_obtain_constant_F64(qb_compiler_context *cxt, float64_t value) {
qb_address *address;
uint32_t i;
for(i = 0; i < cxt->constant_scalar_count; i++) {
address = cxt->constant_scalars[i];
if(address->type == QB_TYPE_F64) {
if(VALUE(F64, address) == value) {
return address;
}
}
}
address = qb_create_constant_scalar(cxt, QB_TYPE_F64);
VALUE(F64, address) = value;
return address;
}
qb_address * qb_obtain_constant_integer(qb_compiler_context *cxt, int64_t value, qb_primitive_type element_type) {
switch(element_type) {
case QB_TYPE_S08: return qb_obtain_constant_S08(cxt, (CTYPE(S08)) value);
case QB_TYPE_U08: return qb_obtain_constant_U08(cxt, (CTYPE(U08)) value);
case QB_TYPE_S16: return qb_obtain_constant_S16(cxt, (CTYPE(S16)) value);
case QB_TYPE_U16: return qb_obtain_constant_U16(cxt, (CTYPE(U16)) value);
case QB_TYPE_S32: return qb_obtain_constant_S32(cxt, (CTYPE(S32)) value);
case QB_TYPE_U32: return qb_obtain_constant_U32(cxt, (CTYPE(U32)) value);
case QB_TYPE_S64: return qb_obtain_constant_S64(cxt, (CTYPE(S64)) value);
case QB_TYPE_U64: return qb_obtain_constant_U64(cxt, (CTYPE(U64)) value);
default: return NULL;
}
}
qb_address * qb_obtain_constant_float(qb_compiler_context *cxt, float64_t value, qb_primitive_type element_type) {
switch(element_type) {
case QB_TYPE_F32: return qb_obtain_constant_F32(cxt, (CTYPE(F32)) value);
case QB_TYPE_F64: return qb_obtain_constant_F64(cxt, (CTYPE(F64)) value);
default: return NULL;
}
}
qb_address * qb_obtain_constant_boolean(qb_compiler_context *cxt, int32_t value) {
return (value) ? cxt->true_address : cxt->false_address;
}
qb_address * qb_create_writable_scalar(qb_compiler_context *cxt, qb_primitive_type element_type);
static void qb_attach_dimensions(qb_compiler_context *cxt, uint32_t *dimensions, uint32_t dimension_count, qb_address *address, int32_t zero_means_unknown) {
if(dimension_count == 1) {
if(dimensions[0] == 0 && zero_means_unknown) {
// if it's zero, it's unknown at compile time
address->array_size_address = qb_create_writable_scalar(cxt, QB_TYPE_U32);